View Compilation Error

0_0_25585937_3223.cpp: In function 'int main()':
0_0_25585937_3223.cpp:19:27: error: 'u' was not declared in this scope
             scanf("%d%d",&u,&v);
                           ^
0_0_25585937_3223.cpp:19:30: error: 'v' was not declared in this scope
             scanf("%d%d",&u,&v);
                              ^